Not able to see list of rooms when adding entry

Something is happening in generating the list of room options. I initially see the list and then it gets wiped out with a bunch of blank options and some error codes.

I am using Moodle 2.7 and MRBS version 2014060902.

Any ideas of what could be causing this. I took a quick look at the code and saw a couple of places where we were pulling in data from block_mrbs_room but it seems strange that initially the options show and then they disappear.

Any ideas what might be happening? Peace - Anthony